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The effects of engine speed and injection characteristics on the flow field and fuel/air mixing in motored two-stroke diesel enginesA numerical analysis is presented on the effects of the engine speed, injection angle, droplet distribution function, and spray cone angle on the flow field, spray penetration and vaporization, and turbulence in a turbocharged motored two-stroke diesel engine. The results indicate that the spray penetration and vaporization, velocity, and turbulence kinetic energy increase with the intake swirl angle. Good spray penetration, vaporization, and mixing can be achieved by injecting droplets of diameters between 50 and 100 microns along a 120-deg cone at about 315 deg before top-dead-center for an intake swirl angle of 30 deg. The spray penetration and vaporization were found to be insensitive to the turbulence levels within the cylinder. The results have also indicated that squish is necessary in order to increase the fuel vaporization rate and mixing.
Document ID
19870035227
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nguyen, H. L.
(NASA Lewis Research Center Cleveland, OH, United States)
Carpenter, M. H.
(NASA Langley Research Center Hampton, VA, United States)
Ramos, J. I.
(Carnegie-Mellon University Pittsburgh, PA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
Mechanical Engineering
Report/Patent Number
AIAA PAPER 87-0227
Accession Number
87A22501
Funding Number(s)
CONTRACT_GRANT: NAG3-21
CONTRACT_GRANT: NAG3-689
Distribution Limits
Public
Copyright
Other

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